Inner class bug in Groovy

gistfile1.groovy

class Parent {
   String name
}
class External extends Parent {
  String outer
  Internal inner(String p) {
    new Internal(inner:p)
  }
  class Internal {
    String inner
    void boom() {
      println "Outer is " + outer + ", inner is " + inner
      println "But parent is " + name // Only works with External.this.name or getName()
    }
  }
}

new External(outer:"good", name:"fucked").inner("good").boom()